Improvements rotary exhaust-cylinders and balanced slide-valves for steam-engines



J. M. SEARLE & G. G. PALMER. Rotary Exhaust-Cylinders and Balanced Slide-Valvefor Steam-Engines.

No. 206,268. Patented July 23, I878;

TON

.nected by interior.

packed piston-T alve.

UNITED STATES JOSEPH M. sEAnLnAND GIDEON e. rALMn z, or

PATENT QFFICE.

ANIIOPE, N. J.

Specification Forming part of Letters Patent No. 206,268,,dnlcd July 23, 1878;

application filed June 6," 1878.

To all whom it may concern:

Be it known that we, J osnrn M. SEARLE and GIDEON G. PALMER, of Stanhope, in the county of Sussex and State of New Jersey, lnve invented a new and Improved Rotary l lxhaust-Gylinder and Balanced Slide-Valve for Steam-Engines, of which the following is a specification:

In the accompanying drawing, Figure 1 represents 'a vertical longitudinal section of our improved rotary exhaust-cylinder for steamengines; Fig. 2, a horizontal section on line am,'1 ig. 1 and Fig. 3, a'vertieal transverse section of the same on line y ;1 ,Fig. 2.

Similar letters of reference indicate corresponding parts.

The object of our invention is to furnish an improved rotary exhaust-cylinder ibr'steamengines,...iu whiclea positive-exhaustisaib tained' at any or all points of the cut-oil, the exhaust-ports remain open during the entire return stroke of the piston.

After the steam is exhausted theexhaustports stay open until the piston makes the entire length of its stroke, so as to get the full benefit of the expansion, and do away entirely with back pressure.

The arrangement 01' the rotary exhaust in the cylinder simplifies the construction of the slide-valve, and dispenses, when a balanced valve is used, entirely with valve-timings, so as to reduce,in conjunction with the improved exhaust, the consumption of fuel and the ex pense for repairs in a consider-{dale degree.

The invention consists of rotaryexhaust rings at both ends of the steam-cyliiuler, which are set by lixcd lugs of the piston engaging beveled checks of the rings when arriving at the end of each stroke. The rings are concranks and .by an outer crank-rod, so that when the exhaust-ports at one end are closed bythe piston the exhaustports at the opposite end are simultaneously opened. 5.

The exhaust-rings areiq)erlorated, and arranged to open or clos ffilhc cxhaustports of the cylindcr i The steam 'is suppliail ,by a top'chest and ports n1 connec 1 onwltlna fyalanced and steam;-

ltcterr lng to the drawjng, A rejn'esents a at the end of the steam-cylinder; 3, thepiston ol the same; and 13 the piston-rod, which is guided in the usual manner by across-head. v

i The piston B is provided at opposite sides, near the cireuniterence,with projecting lugs (I, having curved or beveled faees,jthat engage, when the piston arrives ateither end of its stroke, the inclined or beveled checks 1) ofrotar exhaust-rings O, which are guided in annular end grooves of the cylinder and of the cylinder-heads.

' The exhaust-rings G are made of two sec tions, and provided with radial holes (I, that register with radial ports d of the cylinder, so

as to exhaust the steam." The holes d may also be set intcrmediatcly between the exhaust-- ports (1, so as to interrupt their connection and shut ofi' the exit of steam.

The opcniiigorclosingo'f'the exhaustiiorts is accomplished by the action of the lngs.ot' the piston 13 on the contact-cheeks of the exhaustrings. The exhaust-rings U are also re eessed at their lowermost parts, near tl ie cheeks b, and acted upon by short cranks 1), whose shafts extend through the cylinder, and are connected at the outside by short crank-arms c and by a crank-rod, 1).

The connecting crank-rod l) is made oi. two parts, which are secured by their threaded culls and screwnuts adjustabl y to a center sleeve, 1', so as to admit. the perfect:nliustment ot' the cranks and the exact setting 0!. the exhaust-rings to the ports of the cylinder. The action ol. the piston on one of the rings stroke closes the exhaustports at that end of the cylinder, but sets at the same time the cxhaustring at the opposite end so that its holes register with the opposite exhaust-ports. l

The steam escapesfmmhthe. ports through annular hollowchannels or ducts y and thron gh longitudinal conuecting-ehanuels g to the exhaust-opening at one side oi. the cylinder.

The steam is supplied at the end of each stroke by the aetionot' a balanced pistoirvalve, "I, that slides in a fixed cylindrical sleeve, ll,

of the valve-chest E at the top of the eylin-.

dcr A.

The piston-valve admits steam to the steam- .entrance ports, and is made of an ordinary piston, that has two wide expansion-rillgs, 71-,1it-

ted around it. The rings are cut at one point to allow the steam when it enters the chest to pass into small angular holes h of the pistonheads', and then under the rings, so as to expand them, fit them tightly to-the sleeve, and keep them from leakin The construction of the cylinder with rotary exhaust-rings admits the useof a very simple construction of supply-valvc,,as the exhaust is notflnade through the same. The balanced piston-valve has the advantage, however, of

. requiring no collars or sections of flanged rings to break joints, as it does not matter whether steam passes from one side of the valve to the other.

The expanding rings have to be of the length of the valve-pistomtwith the cut of the outer ring at the top, and of the i ner ring at the bottom, so that the joifi'ts do not come in contact with the ports and admit steam from its face instead of from the edge.

The steam may be cut off at any point of the stroke, and then carried through the whole we claim as new, and desire to secure by Letters llatent, is-

1. The combination of asteam-cylinderhavin'g rotary exhaust-rings and connecting exhaust-ports at both ends with a piston having projecting lugs, and with ring-connecting crank mechanism, that closes the exhaust-ports at one end and simultaneously opens the exhaust-ports at the opposite end of the cylinder, substantially as specified.

2. The combination of the cylinder A, having radial exhaust-ports at both ends, inner rotary exhaust-rin gs 0, having radial. holes, crank recesses, and checks, piston B, having projecting lugs at opposite sides, and ring-connecting cranks D and exterior crank-rod I), substantially as and for the purpose described.

3. The combination of asteam-cylinder having exhaust-ports and rotary exhaust-rings at the ends and steam-supply ports, with a balanced piston-valve, guided in a fixed sleeve ot the valve-chest, substantially as set forth.

at, The combination, with a steam-cylinder having exhaust-ports and rotary exhaust-rings and steam-supply ports, of a balanced steamvalve, guided in a sleeve of thevalve-chest, and havin g split packing-rill gs and steam -openin below the rings, substantially as described.

JOSEPH MINER SEARLE. (iIDEON (r. PALMER.

Witnesses:

JOHN D. LAwnnXcE, A. J. DRAKE, .I'. l). Lawm'mrn, l S. CLARK. 

